Textured ceiling

Hello, I have to remove a 2'x4' section of drywall ceiling that has textured plaster. Once remove I'm going to replace the drywall, put 2 coats of plaster and reproduce the same textured plaster design. It looks like a round ~8inch dip that was done with a mope/sponge. I would like to share a picture of the ceiling to give you a better idea. I don't know where to find that piece of equipment. Thank you!